| Great Northern Railway Classes P & PP | |
| Powertype: | Steam |
| Designer: | Great Northern Railway Class P were two sets of 4-4-0 locomotives for the Great Northern Railway of Ireland (GNRI) introduced from 1892 by locomotive superintendent J.C. Park; four having 6feet driving wheels and eight having 5feet driving wheels. Park was succeeded by Charles Clifford who constructed 17 broadly similar locomotives from 1896 with 6feet driving wheels; these were designated Class PP. The last PP class survived until 1963.References
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